Sennheiser MKH-404
Documentation on the Sennheiser MKH-404 is thin. The record shows an RF condenser microphone with a cardioid polar pattern. It appeared in an Audio product preview (August 1965, p.85) alongside the sibling MKH-405.
The most complete description comes from a surviving example in a 2001 collector profile. The unit belonged to Dave Fontaine of High Strung Music and was believed manufactured circa 1972 (EQ Magazine, May 2001, p.38). Its listed specs: frequency response 40-20,000 Hz, output level -37 dBm referenced to 1 mW/10 dynes/cm², and weighted noise voltage of approximately 7 pV (DIN).
No original price, production dates or period reviews beyond that preview appear to have survived.
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